Materia Design surface. Reference: https://material.io/guidelines/material-design/elevation-shadows.html#objects-in-3d-space-elevation

surface.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:clipToPadding="false"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
android:gravity="center"

    tools:context="com.mujadidia.materialdesigncourse.MainActivity">

<FrameLayout
    android:layout_width="300dp"
    android:layout_height="200dp"
android:background="@color/colorPrimary"

    android:outlineProvider="bounds"
    android:elevation="16dp">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        android:layout_gravity="center"
        style="@style/MyStyle"/>
</FrameLayout>
</RelativeLayout>